ASTM_D_8370_-_22.pdf

Designation:D837022Standard Test Method forField Measurement of Electrochemical Impedance onCoatings and Linings1This standard is issued under the fixed designation D8370;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the procedure for field measure-ment of electrochemical impedance spectroscopy(EIS)forpolymeric coatings over conductive substrates.1.2 This test method covers the parameters for determiningan adequate sample size.1.3 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D16 Terminology for Paint,Related Coatings,Materials,andApplicationsD610 Practice for Evaluating Degree of Rusting on PaintedSteel SurfacesD660 Test Method for Evaluating Degree of Checking ofExterior PaintsD661 Test Method for Evaluating Degree of Cracking ofExterior PaintsD714 Test Method for Evaluating Degree of Blistering ofPaintsG3 Practice for Conventions Applicable to ElectrochemicalMeasurements in Corrosion TestingG106 Practice for Verification of Algorithm and Equipmentfor Electrochemical Impedance MeasurementsG193 Terminology and Acronyms Relating to CorrosionG215 Guide for Electrode Potential Measurement2.2 ISO Standards:3ISO 16773-1 Electrochemical impedance spectroscopy(EIS)on coated and uncoated metallic specimensPart 1:Terms and definitionsISO 16773-2 Electrochemical impedance spectroscopy(EIS)on coated and uncoated metallic specimensPart 2:Collection of dataISO 16773-3 Electrochemical impedance spectroscopy(EIS)on coated and uncoated metallic specimensPart 3:Processing and analysis of data from dummy cellsISO 16773-4 Electrochemical impedance spectroscopy(EIS)on coated and uncoated metallic specimensPart 4:Examples of spectra of polymer-coated and uncoatedspecimens3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminologies G193 and D16.3.2 Definitions of Terms Specific to This Standard:3.2.1 test area,ntotal area of the coating surface within apair of test cells.3.2.2 test location,ndiscrete physical location(s)selectedon each structure for performing the electrochemical imped-ance spectroscopy(EIS)measurements.4.Significance and Use4.1 This test method is suitable for in-service conditionassessment and quality control(QC)testing.4.2 This technique is used to investigate a polymer barriercoating over a conductive substrate and is limited to exposedand accessible coating surfaces.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.48 on Durability of Pipeline Coating and Linings.Current edition approved March 1,2022.Published March 2022.DOI:10.1520/D8370-22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from International Organization for Standardization(ISO),ISOCentral Secretariat,Chemin de Blandonnet 8,CP 401,1214 Vernier,Geneva,Switzerland,https:/www.iso.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.14.3 This test method is applicable to polymer barrier coat-ings of all thicknesses provided the impedance is withinequipment capabilities.Special considerations are required forevaluation of coatings exceeding 2 mm thickness or containingconductive media,such as metal pigments and conductingpolymers.4.4 This test method provides the experimental methodneeded to ensure proper application of field EIS testing andreporting of its results.This test method uses two test cells permeasurement with no elec